Pollutant Concentrations

Air quality readings will be available hourly from 7am to 11pm. Air quality readings from 12am to 6am will be made available at 7am on the same day.

Readings on 26 Dec 2014

View reading for:

Region

24-hr Sulphur dioxide(µg/m3)

24-hr PM10(µg/m3)

1-hr Nitrogen dioxide(µg/m3)a

8-hr Ozone(µg/m3)

8-hr Carbon monoxide(mg/m3)

24-hr PM2.5(µg/m3)

North

7(4)

20(20)

42(-)

4(2)

0.5(5)

10(41)

South

10(6)

18(18)

9(-)

7(3)

0.5(5)

10(41)

East

5(3)

20(20)

29(-)

6(2)

0.6(6)

14(53)

West

2(1)

15(15)

29(-)

8(3)

0.4(4)

9(36)

Central

12(7)

18(18)

47(-)

19(8)

0.5(5)

11(46)

1-hr PM2.5 (µg/m3)b Readings on 26 Dec 2014

View reading for:

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

North

8

13

17

11

7

12

12

12

17

14

7

8

South

15

13

12

9

12

7

4

10

11

11

11

12

East

15

20

18

16

20

19

11

15

10

10

13

15

West

12

13

11

13

8

7

9

5

8

9

7

11

Central

15

13

18

11

15

7

8

11

11

11

14

14

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

North

8

10

14

7

7

8

9

7

3

7

6

-

South

16

14

11

5

6

6

7

3

7

13

6

-

East

12

12

12

6

8

6

6

11

15

19

18

-

West

11

9

7

5

7

5

3

3

8

7

10

-

Central

15

17

12

9

8

8

7

6

11

10

2

-

Note:a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3.

b There is no sub-index for 1-hr PM2.5.

3-hr PSI Readings from 1am to 12am on
26 Dec 2014

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

3-hr PSI

57

54

53

53

52

48

44

41

43

46

45

46

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

3-hr PSI

49

51

51

42

35

28

28

26

29

36

40

-

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.